Exploring the Effect of Porous Structure on Thermal Conductivity in Templated Mesoporous Silica Films

2019 ◽  
Vol 123 (35) ◽  
pp. 21721-21730 ◽  
Author(s):  
Yan Yan ◽  
Sophia C. King ◽  
Man Li ◽  
Tiphaine Galy ◽  
Michal Marszewski ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mesoporous Silica ◽  
Porous Structure ◽  
Silica Films

Controlling Thermal Conductivity in Mesoporous Silica Films Using Pore Size and Nanoscale Architecture

2020 ◽  
Vol 11 (9) ◽  
pp. 3731-3737 ◽  
Author(s):  
Yan Yan ◽  
Man Li ◽  
Sophia King ◽  
Tiphaine Galy ◽  
Michal Marszewski ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Silica Films

Thermal conductivity of BCC-ordered mesoporous silica films

2009 ◽  
Vol 42 (12) ◽  
pp. 125404 ◽  
Author(s):  
Sangwoo Shin ◽  
Tae-Jung Ha ◽  
Hyung-Ho Park ◽  
Hyung Hee Cho
Keyword(s):  
Thermal Conductivity ◽  
Mesoporous Silica ◽  
Ordered Mesoporous Silica ◽  
Silica Films ◽  
Ordered Mesoporous

Estimating Density Reduction and Phonon Localization From Optical Thermal Conductivity Measurements of Porous Silica and Aerogel Thin Films

2011 ◽  
Author(s):  
Patrick E. Hopkins ◽  
Bryan J. Kaehr ◽  
Darren Dunphy ◽  
C. Jeffrey Brinker
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Mesoporous Silica ◽  
Porous Silica ◽  
Thermal Effusivity ◽  
Solid Matrix ◽  
Silica Films ◽  
Density Reduction ◽  
The Difference ◽  
Phonon Localization

In this work, we measure the thermal conductivity of mesoporous silica and aerogel thin-films using a non-destructive optical technique: time domain thermoreflectance (TDTR). Due to the rough surfaces of the optically transparent silica-based films, we evaporate an Al film on a glass cover slide and fabricate the silica structures directly on the Al film, providing a “probe-through-the-glass” configuration for TDTR measurements. This allows the thermal conductivity of mesoporous silica and aerogel thin films to be measured with traditional TDTR analyses. As the thermoreflectance response is highly dependent on the thermal effusivity of the porous structures, we estimate the density of the films by varying the heat capacity in our analysis. This density determination assumes that the solid matrix in the silica structure has the thermal conductivity as bulk SiO2, which is valid if all the lattice vibrations are localized, consistent with the minimum thermal conductivity concept. We independently determine the density of the porous silica films with nitrogen sorption measurements of thin films using a surface acoustic wave (SAW) technique. The difference between the determined from the SAW technique and that estimated by the TDTR effusivity analysis lends insight into the relative contributions of localized and propagating modes to thermal transport.

3D Periodic Arrays of Nanoparticles Inside Mesoporous Silica Films

2001 ◽  
Vol 707 ◽  
Author(s):  
Sophie Besson ◽  
Thierry Gacoin ◽  
Catherine Jacquiod ◽  
Christian Ricolleau ◽  
Jean-Pierre Boilot
Keyword(s):  
Mesoporous Silica ◽  
Porous Structure ◽  
Porous Silica ◽  
Silica Film ◽  
Silica Matrix ◽  
Metal Sulfides ◽  
Cds Nanoparticles ◽  
Silica Films ◽  
Periodic Arrays ◽  
Porous Silica Film

ABSTRACTCdS nanoparticles were grown inside a 3D hexagonal porous silica film. The film pore size and organization allowed the perfect control of particle repartition and size (3.5 nm), leading to a 3D nanocrystal array inside the silica matrix. The method was extended to another silica porous structure with larger pores, which allowed to obtain larger particles (5.8 nm). This process was then successfully generalized to other metal sulfides.

3D Periodic Arrays of Nanoparticles Inside Mesoporous Silica Films

2001 ◽  
Vol 704 ◽  
Author(s):  
Sophie Besson ◽  
Thierry Gacoin ◽  
Catherine Jacquiod ◽  
Christian Ricolleau ◽  
Jean-Pierre Boilot
Keyword(s):  
Mesoporous Silica ◽  
Porous Structure ◽  
Porous Silica ◽  
Silica Film ◽  
Silica Matrix ◽  
Metal Sulfides ◽  
Cds Nanoparticles ◽  
Silica Films ◽  
Periodic Arrays ◽  
Porous Silica Film

AbstractCdS nanoparticles were grown inside a 3D hexagonal porous silica film. The film pore size and organization allowed the perfect control of particle repartition and size (3.5 nm), leading to a 3D nanocrystal array inside the silica matrix. The method was extended to another silica porous structure with larger pores, which allowed to obtain larger particles (5.8 nm). This process was then successfully generalized to other metal sulfides.

Design of oriented mesoporous silica films for guiding protein adsorption states

2021 ◽  
Author(s):  
Yadong Chai ◽  
Yuri Maruko ◽  
Zizhen Liu ◽  
Motohiro Tagaya
Keyword(s):  
Mesoporous Silica ◽  
Protein Adsorption ◽  
Silica Films

The highly-oriented cylindrical mesoporous silica films were synthesized on the rubbing-treated polyimide, and effectively adsorbed the mesoscale biomolecules such as proteins and guided to be their anisotropic adsorption shapes.

scholarly journals Design of Thermal Insulation Materials with Different Geometries of Channels

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2217
Author(s):  
Daniela Șova ◽  
Mariana Domnica Stanciu ◽  
Sergiu Valeriu Georgescu
Keyword(s):  
Thermal Conductivity ◽  
Porous Structure ◽  
Base Material ◽  
Cost Effective ◽  
Heat Radiation ◽  
Average Temperature ◽  
Temperature Regimes ◽  
The Face ◽  
Inclined Channels ◽  
Air Channels

Investigating the large number of various materials now available, some materials scientists promoted a method of combining existing materials with geometric features. By studying natural materials, the performance of simple constituent materials is improved by manipulating their internal geometry; as such, any base material can be used by performing millimeter-scale air channels. The porous structure obtained utilizes the low thermal conductivity of the gas in the pores. At the same time, heat radiation and gas convection is hindered by the solid structure. The solution that was proposed in this research for obtaining a material with porous structure consisted in perforating extruded polystyrene (XPS) panels, as base material. Perforation was performed horizontally and at an angle of 45 degrees related to the face panel. The method is simple and cost-effective. Perforated and simple XPS panels were subjected to three different temperature regimes in order to measure the thermal conductivity. There was an increase in thermal conductivity with the increase in average temperature in all studied cases. The presence of air channels reduced the thermal conductivity of the perforated panels. The reduction was more significant at the panels with inclined channels. The differences between the thermal conductivity of simple XPS and perforated XPS panels are small, but the latter can be improved by increasing the number of channels and the air channels’ diameter. Additionally, the higher the thermal conductivity of the base material, the more significant is the presence of the channels, reducing the effective thermal conductivity. A base material with low emissivity may also reduce the thermal conductivity.

scholarly journals Effects of morphology and pore size of mesoporous silicas on the efficiency of an immobilized enzyme

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 10010-10017
Author(s):  
Ping-Chung Kuo ◽  
Zhi-Xun Lin ◽  
Tzi-Yi Wu ◽  
Chun-Han Hsu ◽  
Hong-Ping Lin ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Immobilized Enzyme ◽  
Mesoporous Silicas ◽  
High Loading ◽  
Loading Capacity ◽  
Silica Films

Mesoporous silica films were used as supports with high loading capacity and enzyme activity.

Free-standing large-mesoporous silica films decorated with lanthanum as new adsorbents for efficient removal of phosphate

2019 ◽  
Vol 296 ◽  
pp. 111815 ◽  
Author(s):  
Xuan Jing ◽  
Yaxin Wang ◽  
Li Chen ◽  
Yunyun Wang ◽  
Xinyan Yang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Efficient Removal ◽  
Free Standing ◽  
Silica Films

Research on Porous Properties of Air-Entrained Lightweight Aggregate Concrete

2013 ◽  
Vol 652-654 ◽  
pp. 1209-1212
Author(s):  
Wei Xin Hu ◽  
Abulitipu. Abudula
Keyword(s):  
Thermal Conductivity ◽  
Porous Structure ◽  
Concrete Strength ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Materials Properties ◽  
Porous Properties ◽  
Concrete Materials ◽  
The Right

Lightweight aggregate concrete with bleed air : the air-entraining agent added to the lightweight aggregate concrete , cement paste to form the porous structure of the porous structure of the right amount of artificial lightweight aggregate concrete . Reduce the density of the concrete to improve the insulation properties of the concrete . Applied to structural insulation concrete strength than 20Mpa, the thermal conductivity is less than 0.36W / ( m • K) . Of lightweight aggregate structure insulation concrete materials properties and microstructure of variation with air entraining agent .

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